KR20230120673A - Circuit control method, battery and its controller and management system, electrical device - Google Patents

Abstract

Embodiments of the present application relate to the field of battery technology, and provide a circuit control method, a battery and its controller and management system, and an electric device. The circuit control method determines whether the voltage is greater than a first threshold value and whether a rate of change within a first duration is less than a second threshold value, wherein the charging circuit is a circuit connecting a battery and a generator on the device, and the power terminal voltage is the output voltage of the generator; and sending a first command to conduct the charging circuit when the power terminal voltage of the battery charging circuit on the device is greater than the first threshold and the rate of change within the first duration is less than the second threshold. Through the above method, when the battery charging circuit is conducted while the device is not started and the device is subsequently started, thermal runaway of the battery due to overcharging of the lithium battery can be prevented, thereby improving battery safety.

Description

Circuit control method, battery and its controller and management system, electrical device

Embodiments of the present invention relate to the field of battery technology, and specifically, to a circuit control method, a battery controller, a battery management system, a battery, an electric device, and a vehicle.

BACKGROUND OF THE INVENTION Batteries are widely used in electronic devices such as mobile phones, notebook computers, battery cars, automobiles, airplanes, ships, toy cars, toy boats, toy airplanes and power tools.

In the development of battery technology, safety issues cannot be ignored, and in particular, when the battery is overcharged, it is easy to cause serious safety accidents. Therefore, how to prevent overcharging of a battery to improve its safety performance is a problem that has been receiving attention in the art.

In view of the above problems, embodiments of the present invention provide a circuit control method, a battery controller, a battery management system, a battery, an electric device, and a vehicle capable of preventing battery overcharging and improving safety performance of the battery.

According to a first aspect of the embodiments of the present invention, there is provided a circuit control method, which includes obtaining a device wake-up signal; Determine whether a power terminal voltage of a battery charging circuit in the device is greater than a first threshold and whether a rate of change within a first duration is less than a second threshold, wherein the charging circuit connects a battery in the device and a generator. a circuit, wherein the power terminal voltage is an output voltage of the generator; and when a power supply voltage of a battery charging circuit on the device is greater than a first threshold and a rate of change within a first duration is less than a second threshold, send a first command, wherein the first command is the first command of the charging circuit. 1 controlling the switching unit to be closed to conduct the charging circuit.

The circuit control method in the embodiment of the present invention obtains a device wake-up signal and a power supply voltage of a charging circuit, determines whether the power supply voltage of the charging circuit is greater than a first threshold value, and determines whether a rate of change within a first duration is a second threshold value. Determine whether it is less than Since the device wake-up signal exists only after the device is started, the power supply voltage of the charging circuit is greater than the first threshold value, and the rate of change within the first duration is less than the second threshold value, the method can be applied to the charging circuit of the battery. When all of the above conditions are satisfied, the device can be started so that the device is started when the charging circuit of the battery is turned on. The charging circuit is discharged with a large current to prevent the switch from sticking to the charging circuit, and the safety of the battery is improved by preventing thermal runaway of the battery due to overcharging of the lithium battery.

In some embodiments, the method may include whether a state of charge (SOC) of the battery is greater than a third threshold, whether a fault alarm exists in the battery, and whether a temperature of a battery cell of the battery is in a first range. Further comprising the step of determining; When the voltage of the power terminal of the battery charging circuit in the device is greater than a first threshold and the rate of change within the first duration is less than the second threshold, the step of sending the first command comprises: the power of the battery charging circuit in the device; The voltage is greater than a first threshold, the rate of change within the first duration is less than a second threshold, the SOC of the battery is greater than a third threshold, there is no fault alarm in the battery, and the battery and sending a first command when the temperature of the battery cell is within the first range.

In the above embodiment, it is determined whether the SOC of the battery is greater than the third threshold, whether there is a fault alarm in the battery, and whether the temperature of the battery cell of the battery is within the first range, so that the SOC of the battery is the third threshold. By controlling the charging circuit of the battery to be conducted only when the value is greater than the value, there is no fault alarm in the battery, and the temperature of the battery cell of the battery is within the first range, floating charging of the battery and safety problems can be prevented.

In some embodiments, the method may determine whether, after the charging circuit of the battery is turned on, a change rate of the charging current of the battery within the second duration is greater than a fourth threshold, or the voltage of a battery cell of the battery is the first 5 whether greater than or equal to a threshold value, or whether a fault alarm exists in the battery, or whether the temperature of the battery cell is not within a first range, or whether the SOC of the battery is less than or equal to a third threshold value determining; and the change rate of the charge current of the battery within the second duration is greater than a fourth threshold, the voltage of a battery cell in the battery is greater than or equal to a fifth threshold, a fault alarm exists in the battery, or the When the temperature of the battery cell is not within the first range or the SOC of the battery is less than or equal to the third threshold, a second command is transmitted, wherein the second command controls the first switching unit in the charging circuit to be cut off. and further comprising the step of blocking the charging circuit.

In the above embodiment, it is determined whether the SOC of the battery is greater than the third threshold, whether there is a fault alarm in the battery, and whether the temperature of the battery cell of the battery is within the first range, so that the SOC of the battery is the third threshold. By controlling the charging circuit of the battery to be conducted only when the value is greater than the value, there is no fault alarm in the battery, and the temperature of the battery cell of the battery is within the first range, floating charging of the battery and safety problems can be prevented.

In some embodiments, the method further includes determining whether a device wakeup signal exists and whether the power supply voltage is less than a sixth threshold; and when a device wake-up signal exists and the power supply voltage is less than a sixth threshold, send a third command, wherein the third command controls the first switching unit in the charging circuit to close, so that the charging circuit is closed. and conducting so that the charging circuit is in a first conducting state.

In the above embodiment, it is determined whether a device wake-up signal exists and whether the power supply voltage is less than the sixth threshold, and charging is performed when the device wake-up signal exists and the power supply voltage is less than the sixth threshold. By controlling the circuit to conduction and charging the lead-acid battery with the lithium battery, a problem in which the vehicle does not start due to power loss of the lead-acid battery when the vehicle is left unattended for a long time is prevented.

In some embodiments, the method further comprises determining whether the SOC of the battery is greater than a thirty-seventh threshold and whether a fault alarm exists in the battery; If the device wake-up signal exists and the power supply voltage is less than the sixth threshold, sending a third command comprises: a device wake-up signal exists and the power supply voltage is less than the sixth threshold; , when the SOC of the battery is greater than a 73rd threshold and there is no fault alarm in the battery, sending a third command.

In the above embodiment, it is determined whether the SOC of the battery is greater than the seventh threshold and whether there is a fault alarm in the battery, and when the SOC of the battery is greater than the seventh threshold and there is no fault alarm in the battery By controlling the charging circuit to conduct, overdischarge and safety problems of the lithium battery are prevented.

In some embodiments, the method may include determining whether a conduction time of the charging circuit is greater than an eighth threshold value in the first conduction state; and if the conduction time of the charging circuit is greater than an eighth threshold, sending a fourth command, wherein the fourth command controls the first switching unit in the charging circuit to be cut off to cut off the charging circuit. more includes

In the above embodiment, it is determined whether the conduction time of the charging circuit is greater than the eighth threshold, and if the conduction time of the charging circuit is greater than the eighth threshold, the charging circuit is cut off, so that the lithium battery is discharged once in the vehicle. It not only ensures that lead-acid batteries are charged to meet the electrical energy required for start-up, but also prevents over-discharge of lithium batteries.

In some embodiments, the method may include determining whether the SOC of the battery is greater than a 73rd threshold; and when the SOC of the battery is greater than a 73rd threshold, sending a fifth command, wherein the fifth command is for controlling a second switching unit in a discharge circuit of the battery to be closed so as to conduct the discharge circuit; The discharging circuit further comprises a circuit connecting the battery on the device and the electrical equipment.

In the above embodiment, it is determined whether the SOC of the battery is greater than the seventh threshold value, and if the SOC of the battery is greater than the seventh threshold value, the battery discharge circuit is controlled to conduct, thereby preventing overdischarge of the lithium battery.

In some embodiments, the method determines whether, after a discharge circuit of the battery is conducted, whether the device wake-up signal is present, or a fault alarm is present in the battery, or the SOC of the battery is at a 73rd threshold value. determining whether it is less than, equal to, or greater than; If the device wake-up signal is present, a fault alarm is present in the battery, or the SOC of the battery is less than, equal to, or greater than a 73rd threshold, send a sixth command, the sixth command comprising the discharge circuit and controlling the second switching unit in the circuit to cut off the discharge circuit.

In the above embodiment, it is judged whether the device wake-up signal is not present, or whether the battery has a fault alarm, or whether the SOC of the battery is less than or equal to the seventh threshold, so that the device wake-up signal is not present. In the case where the lithium battery is not discharged, the battery has a fault alarm, or the SOC of the battery is less than or equal to the seventh threshold value, the discharge circuit is controlled to be cut off, thereby preventing overdischarge of the lithium battery and safety problems.

According to a second aspect of the embodiments of the present invention, there is provided a battery controller, which includes one or more processors for performing the steps of the circuit control method as above, working alone or jointly.

According to a third aspect of an embodiment of the present invention, there is provided a battery management system comprising: at least one processor; and a memory communicatively coupled to the at least one processor, wherein instructions executable by the at least one processor are stored in the memory, and the instructions are executed by the at least one processor so that the at least one processor The steps of the circuit control method as described above are implemented.

According to a fourth aspect of the embodiments of the present invention, there is provided a battery, which includes the above battery controller or the above battery management system.

According to a fifth aspect of the embodiments of the present invention, an electrical device is provided, which includes a battery as above for providing electrical energy.

According to a sixth aspect of the embodiments of the present invention, there is provided a vehicle, including a lithium battery, a generator and a vehicle wake-up switch; The lithium battery is connected to the generator to form a charging circuit, the lithium battery includes a battery management system, and the battery management system obtains a vehicle wake-up signal; It is determined whether the power terminal voltage of the lithium battery charging circuit of the vehicle is greater than a first threshold value and whether a rate of change within a first duration is smaller than a second threshold value, wherein the charging circuit determines whether the lithium battery of the vehicle and the generator are A circuit connecting the power terminal voltage is the output voltage of the generator; When the voltage of the power terminal of the battery charging circuit of the vehicle is greater than a first threshold and a rate of change within a first duration is less than a second threshold, a first command is transmitted, wherein the first command is the first command of the charging circuit This is to conduct the charging circuit by controlling the switching unit to be closed.

The above description is only an overview of the technical solutions of the present invention, and can be implemented according to the contents of the specification to better understand the technical solutions of the present invention, and also the above and other objects, features and advantages of the present invention. For a clearer understanding, specific examples of specific embodiments of the present invention are given below.

Hereinafter, features, advantages and technical effects of exemplary embodiments of the present invention will be described with reference to the accompanying drawings.
1 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention.
FIG. 2 is a block diagram of a power system structure on an electric device to which the method of FIG. 1 is applied.
3 is a circuit structure diagram of a battery to which the method of FIG. 1 is applied.
4 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention.
5 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention.
6 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention.
7 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention.
8 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention.
9 is a flow diagram of a circuit control method provided by some embodiments of the present invention.
10 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention.
11 is a structural schematic diagram of a battery controller provided by some embodiments of the present invention.
12 is a structural schematic diagram of a battery management system provided by some embodiments of the present invention.
13 is a structural schematic diagram of a battery provided by some embodiments of the present invention.
14 is a structural schematic diagram of a battery provided by some embodiments of the present invention.
15 is a structural schematic diagram of an electric device provided by some embodiments of the present invention.
16 is a structural schematic diagram of a vehicle provided by some embodiments of the present invention.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following clearly and completely describes the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments of the present invention, but the described implementations It is clear that examples are only some embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person skilled in the art without creative work based on the embodiments of the present invention shall fall within the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as the common understanding of one of ordinary skill in the art; Terms used in the specification of the present invention are only for describing specific embodiments and are not intended to limit the present invention; The terms “comprise”, “have” and any variations thereof in the specification and claims of this invention and in the description of the figures above are intended to include a non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present invention or the drawings are not intended to describe a specific order or master-servant relationship, but to distinguish different objects. In the description of the present invention, otherwise Unless otherwise noted, “plurality” means two or more.

The term “embodiment” referred to in the present invention means that a particular feature, structure, or characteristic described in conjunction with an embodiment may be included in at least one embodiment of the present invention. It may not refer to an embodiment, nor is it an independent or alternative embodiment that is mutually exclusive of other embodiments.It is expressly and implicitly understood by those skilled in the art that an embodiment described in the present invention may be combined with other embodiments. .

As above, when the term "comprising/comprising" is used herein, it is used to explicitly indicate the presence of said feature, integer, step or component, but the presence of one or more other features, integers, steps or elements. As used herein, the singular forms "a", "an" and "the" include the plural unless the context clearly dictates otherwise.

As used herein, the words “one” and “one” may mean one, but may also mean “at least one” or “one or more”. The term "about" generally means plus or minus 10%, or more specifically 5%, of the stated value. As used in the claims, the term "or" means "and/or" unless explicitly indicated to refer only to alternative alternatives.

In the present invention, the term "and/or" is only an association relationship describing an association object, and means that three relationships exist, for example, A and/or B only exist in A, and A and B exist at the same time. Existence means three cases in which only B exists. In addition, in the present invention, the sign "/" generally means that the contextually related object is an "or" relationship.

Batteries referred to in the art can be classified into disposable batteries and rechargeable batteries according to whether or not they can be charged. A disposable battery is commonly referred to as a “primary” battery and a primary battery because it cannot be recharged after its electricity quantity is exhausted and must be disposed of. A rechargeable battery is also called a secondary battery, a secondary battery, or a storage battery. Rechargeable batteries differ from disposable batteries in manufacturing materials and processes, and have the advantage of being able to be used repeatedly after charging and having a higher output current load capacity than most disposable batteries. Current types of common rechargeable batteries include lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries are still widely used despite their relatively high price due to their light weight, large capacity (1.5 to 2 times the capacity of NiMH batteries of the same weight), no memory effect, and low self-discharge rate.

The battery described in the embodiments of the present invention means a rechargeable battery. Hereinafter, the concept of the present invention will be mainly described using a lead-acid battery and a lithium ion battery as examples. It should be understood that any other suitable type of rechargeable battery applies. A battery referred to in the embodiments of the present invention means a single physical module including one or more battery cells (also referred to as cells) to provide higher voltage and capacity. For example, a battery referred to in the present invention may include a battery module or a battery pack. A battery cell includes a positive electrode piece, a negative electrode piece, an electrolyte solution, and a separator, and is a basic structural unit of a battery module and a battery pack. Cathode materials commonly used in lithium-ion batteries include lithium cobaltate, lithium manganate, lithium nickelate, lithium iron phosphate, and ternary materials (eg, nickel cobalt lithium manganate). Materials include carbon materials (eg, graphite) and silicon-based materials, and commonly used separator materials include polyethylene (PE) or polypropylene (PP)-based polyolefin-based materials. do. Battery cells are generally classified into cylindrical battery cells, prismatic battery cells, and soft pack battery cells according to packaging methods.

A plurality of battery cells may be connected in series and/or in parallel through electrode terminals to be applied to various application scenarios. In some high-power application scenarios, such as electric vehicles, the application of batteries includes three levels: battery cells, battery modules and battery packs. The battery module is formed by electrically connecting a certain number of battery cells and inserting them into a frame in order to protect the battery cells from external shock, thermal vibration, and the like. A battery pack is the final state of a battery system installed in a vehicle. Currently, most battery packs are manufactured by assembling various control and protection systems such as a battery management system (BMS) and a thermal management member into one or more battery modules. According to the development of technology, the level of battery module can be omitted, that is, a battery pack is directly formed with battery cells. This improvement improves the gravimetric and volumetric energy densities of the battery system while significantly reducing component count. The battery referred to in the present invention includes a battery module or a battery pack.

Currently, a power source of a vehicle is mainly used to start an engine, and generally a lead-acid battery or a lithium battery is used as a power source. As the socio-economic level improves, demands for environmental protection, energy saving, and comfort of vehicles are also increasing, and corresponding in-vehicle devices have also appeared according to the needs of the times. Parking air conditioners, for example, address user needs for comfort, such as ambient air temperature, humidity and flow rate. Therefore, the vehicle's power source must not only meet the demand for starting the engine in various environments, but also meet the requirement for supplying power to on-vehicle electrical equipment such as parking air conditioners when the vehicle is parked.

Lead-acid batteries are cheap and stable in quality, but they are heavy, have high self-discharge rates, and have short lifespan. Lithium batteries are light in weight, small in volume, have a low self-discharge rate and have a long service life, but lithium batteries with large capacity and high magnification are expensive and cannot meet the demand for starting engines at low temperatures. Therefore, a lead-acid battery and a lithium battery are generally used in parallel as a starting and parking power source for automobiles. Among them, the lead-acid battery is mainly used to start the engine, and the lithium battery is mainly used to provide power to the parking air conditioner.

However, when a lead-acid battery and a lithium battery are connected in parallel and used as starting and parking power sources, when the vehicle is started with the lithium battery's charging circuit switch closed, the lithium battery's charging circuit discharges a large current to damage the charging circuit. A switch (eg, a relay) is stuck, resulting in overcharging of the lithium battery and thermal runaway of the battery, resulting in a safety accident such as a battery fire.

In view of this, the present invention provides a circuit control method, a battery controller, a battery management system, a battery, an electric device, and a vehicle, and their designs will be described in detail below. It can be understood that the circuit control method, battery controller, and battery management system described in the embodiments of the present invention can be applied to various devices using batteries, particularly vehicles. Hereinafter, for convenience of description, a case in which a vehicle is applied will be described as an example.

1 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention. The circuit control method 100 can be applied to a battery in an electric device, and furthermore, can be applied to a BMS of a battery. Hereinafter, the concept of the present invention will be described taking a case where this method is applied to a BMS of a battery on a vehicle as an example. The circuit control method,

S101: Acquiring a device wake-up signal;

S102: Determine whether the voltage of the power terminal of the battery charging circuit on the device is greater than a first threshold value and whether a rate of change within a first duration is smaller than a second threshold value, wherein the charging circuit connects the battery on the device and the generator. circuit, wherein the power supply voltage is the output voltage of the generator; and

S103: When the power terminal voltage of the battery charging circuit on the device is greater than the first threshold and the rate of change within the first duration is less than the second threshold, send a first command, wherein the first command is the first switching in the charging circuit and controlling the unit to be closed to conduct the charging circuit.

FIG. 2 is a block diagram of a power system structure on an electric device to which the method of FIG. 1 is applied. Referring to FIG. 2 , the electric device includes a parking power source (a lithium battery is taken as an example in this embodiment), a lead-acid battery, a generator, an engine, a vehicle wake-up switch, and electrical equipment. The first port (P ₁₁ ) of the lithium battery is connected to the first port (P ₂₁ ) of the generator and the lead-acid battery, respectively, to form a charging circuit A; The second port P ₁₂ of the lithium battery is connected to the electrical equipment to form a discharge circuit B between the lithium battery and the electrical equipment. The first port (P ₂₁ ) of the lead-acid battery is also connected to the engine to form a circuit C providing power to start the engine. A third port (P ₁₃ ) of the lithium battery is connected to a vehicle wake-up switch for receiving a device wake-up signal.

The charging circuit is a circuit connecting the battery and the generator on the device, and may be specifically the charging circuit A connecting the lithium battery, the generator, and the lead-acid battery in FIG. 2 . 3 is a circuit structure diagram of a battery to which the method of FIG. 1 is applied, and the charging circuit may be the charging circuit A1 of FIG. 3 .

The device wake-up signal is an electrical signal for starting the device, for example, in a vehicle, the ON gear of the vehicle keyhole is KL15, one end is connected to the vehicle-mounted power source, and the other end is connected to the BMS. Before ignition, the KL15 switch is off, so there is no signal input, and the BMS does not work; After ignition, the KL15 switch is closed, the power management chip is activated, and the KL15 hardwired wake-up signal is sent to the BMS to wake up the BMS, thereby starting the vehicle. Therefore, the device wake-up signal in the vehicle may be the KL15 hardwired wake-up signal, and the BMS acquires the corresponding signal after the vehicle is ignited.

The presence of the device wake-up signal is the first condition that the charging circuit can conduct, and the power terminal voltage of the battery charging circuit on the device is greater than the first threshold is the second condition that the charging circuit can conduct, and the first A change rate of the power terminal voltage of the battery charging circuit of the device within the duration is smaller than the second threshold value is a third condition for allowing the charging circuit to conduct.

If the device wake-up signal does not exist and the first condition is not satisfied, this means that the vehicle has not been started. At this time, when the charging circuit is energized, the above-mentioned charging circuit of the lithium battery is discharged with a large current, and the lithium battery overcharging, which can cause thermal runaway problems in the battery. If the device wake-up signal is present and satisfies the first condition, it means that the vehicle can be started to conduct the charging circuit.

In order to further prevent the charging circuit from conducting when the vehicle is not started, it also collects some parameters of the battery through the BMS to make corresponding judgments. For example, the voltage of the power terminal of the battery charging circuit may be collected. The power terminal voltage is the output voltage of the generator, for example, the voltage at point a connected to the first port of the generator in FIG. 3 . Point a is located outside the first switching unit K1 on the charging circuit A1 (where “outside” means connected to the outside of the battery), and the voltage at point a is the first switching unit K1 on the charging circuit A1. is the outer voltage of It can be understood that since point a is also connected to the first port of the lead-acid battery, the external voltage is also the voltage of the lead-acid battery. By connecting point a to the sampling port of the BMS, sampling of the voltage at point a can be implemented. The first switching unit K1 may be an element such as a relay capable of conducting and blocking a circuit. As can be appreciated, the first switching unit is located inside the lithium battery.

A first threshold may be set at the voltage of the power supply terminal of the battery charging circuit. If the voltage is less than or equal to the first threshold and does not satisfy the second condition, this means that the vehicle does not start and the charging circuit cannot be conducted. means When the voltage is greater than the first threshold and satisfies the second condition, it means that the vehicle can be started and the charging circuit can be conducted.

Generally, the voltage of a lead-acid battery may be higher than that of a lithium battery after being parked and stationary for a long time. After the vehicle is started, the output voltage of the generator is in a steady state after the engine rotation speed≥idling speed is reached, and is generally higher than the highest voltage of the lead-acid battery after stationary. Therefore, the first threshold can be set according to the output voltage of the generator and the highest voltage of the lead-acid battery after stationary. The first threshold may be set to be less than the output voltage of the generator and greater than the highest voltage of a fully charged lead-acid battery that has been left standing for a certain duration. For example, if the output voltage of the generator is 28±0.3V, and the highest voltage of the lead-acid battery drops from 29V to about 26V after standing for 300s, the first threshold is a value greater than 26V and less than 27.7V, for example It is set to 27V. When the voltage of the power terminal of the charging circuit is less than or equal to the first threshold value, it means that the vehicle is not started. If the voltage is greater than the first threshold, it means that the vehicle has been started. The constant duration may be set according to the duration for which the voltage of the lead-acid battery falls to a specific stable value after stationary. For example, the constant duration is the shortest duration required for the voltage of the lead-acid battery to fall to a specific stable value after stationary. set by time

After the lead-acid battery is fully charged and left standing, the voltage of the lead-acid battery may be higher than that of the lithium battery, but after the lead-acid battery is fully charged, when the vehicle is turned off, that is, the lead-acid battery charging circuit is powered off, and left standing for a certain duration. After that, the voltage of the lead-acid battery drops to some extent. Accordingly, it is also possible to set a second threshold value for the rate of change of the voltage of the power supply terminal of the battery charging circuit within the first duration, and when the rate of change is greater than or equal to the second threshold value and does not satisfy the third condition, it is the vehicle It means that the power of the power supply is off and the charging circuit cannot be conducted because it does not start. When the change rate is less than the second threshold and satisfies the third condition, it means that the vehicle can be started and the charging circuit can be conducted.

The BMS may calculate a rate of change of the power supply voltage within the first duration according to the obtained power supply voltage and compare it with a second threshold value. The first duration can be determined according to the time range in which the voltage change rate is relatively obvious after the lead-acid battery is fully charged and turned off, and the second threshold is the highest voltage after the lead-acid battery is fully charged and the power is turned off and left. It can be set according to the minimum change rate between the highest voltages after a certain duration has elapsed. The second threshold value may be set to be less than a minimum value of a rate of change between the highest voltage after the lead-acid battery is fully charged and the highest voltage after a certain duration of time after the power is turned off. For example, if the time range in which the voltage change rate becomes relatively apparent after the lead-acid battery is fully charged is 5 minutes (300 s), the first duration may be set to 300 s. If the highest voltage is 29V after a lead-acid battery is fully charged, and the voltage drops to 26V after power off and standing for 300s, the second threshold is a value less than (29-26)/29=10.34%, for example 10% can be set to

In summary, in S103, the first switching unit in the charging circuit is controlled to be closed only when the first condition, the second condition, and the third condition are all satisfied to conduct the charging circuit.

As can be understood, the charging circuit is not conducted unless any one of the first condition, the second condition, and the third condition is satisfied, thereby maintaining the blocking state of the charging circuit or blocking the charging circuit.

By sending a first command to the first switching unit in the charging circuit through a battery management unit (BMU) interface of the BMS, the first switching unit in the charging circuit is controlled to be closed to conduct the charging circuit. The first command may be a high-low level signal.

The circuit control method in the embodiment of the present invention obtains a device wake-up signal and a power supply voltage of a charging circuit, determines whether the power supply voltage of the charging circuit is greater than a first threshold value, and determines whether a rate of change within a first duration is a second threshold value. Determine whether it is less than Since the device wake-up signal exists only after the device is started, the power supply voltage of the charging circuit is greater than the first threshold value, and the rate of change within the first duration is less than the second threshold value, the method can be applied to the charging circuit of the battery. When all of the above conditions are satisfied, the device can be started so that the device is started when the charging circuit of the battery is turned on. The charging circuit is discharged with a large current to prevent the switch from sticking to the charging circuit, and the safety of the battery is improved by preventing thermal runaway of the battery due to overcharging of the lithium battery.

In some embodiments, other conditions for conduction of the charging circuit may also be set. 4 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention. As shown in Figure 4, the circuit control method,

S101: Acquiring a device wake-up signal;

S102: Determine whether the voltage of the power terminal of the battery charging circuit on the device is greater than a first threshold value and whether a rate of change within a first duration is smaller than a second threshold value, wherein the charging circuit connects the battery on the device and the generator. circuit, wherein the power supply voltage is the output voltage of the generator;

S403: judging whether the SOC of the battery is greater than a third threshold, whether a failure alarm exists in the battery, and whether the battery cell temperature of the battery is within a first range; and

S404: The power terminal voltage of the battery charging circuit on the device is greater than the first threshold, the rate of change within the first duration is less than the second threshold, the SOC of the battery is greater than the third threshold, and the battery has a fault alarm. not present, and when the temperature of a battery cell of the battery is within a first range, sending a first command, wherein the first command is for controlling a first switching unit in a charging circuit to be closed so as to conduct the charging circuit. includes

Here, the specific implementation process of S101 and S102 is basically the same as that of S101 and S102 in the above-described embodiment, and the implementation process can refer to the above description.

The SOC of the battery being greater than the third threshold is the fourth condition that the charging circuit can conduct, the absence of a fault alarm in the battery is the fifth condition that the charging circuit can be conducting, and the temperature of the battery cell of the battery Being in the first range is the sixth condition that the charging circuit can be conducted.

SOC means state of charge. The BMS acquires the SOC of the lithium battery and determines whether the SOC is greater than a third threshold. The third threshold value may be determined according to a cell voltage value of the lithium battery that is dropped due to depolarization of the battery cell after the lithium battery is fully charged and the charging circuit is cut off. For example, the third threshold is 95%. After the lithium battery is fully charged and the charging circuit is cut off, the cell voltage of the lithium battery drops due to the depolarization of the battery cell, so if the charging circuit is closed at this time, floating charging occurs. Therefore, the charging circuit can be controlled to conduct only when the SOC is greater than the third threshold by using the fact that the SOC is greater than the third threshold as the fourth condition that the charging circuit can be turned on, thereby preventing the floating charging problem. do.

If there is a fault alarm in the battery, the battery cannot be charged, otherwise it is easy to cause safety problems. Since there is no fault alarm in the battery, the charging circuit can be controlled to conduct only when the fifth condition is satisfied, thereby preventing safety problems from occurring.

When charging the battery, it is necessary to ensure that the temperature of the internal battery cell is within the allowable charging range, otherwise it is easy to cause safety problems. The first range is the above allowable charging range, for example, 0 to 55°C. The sixth condition is satisfied only when the temperature of the battery cell of the battery is in the first range, and the charging circuit is controlled to be conducted, thereby preventing a safety problem from occurring.

The fourth condition, the fifth condition, and the sixth condition and the above-mentioned first condition, second condition, and third condition together are used as necessary conditions for determining whether or not the charging circuit can be turned on. Accordingly, the first switching unit in the charging circuit is controlled to be closed only when all of the above conditions are satisfied in S404 to conduct the charging circuit.

It can be understood that the charging circuit is not conducted unless any of the above conditions are satisfied, thereby maintaining the charging circuit blocking state or blocking the charging circuit.

In the above embodiment, it is determined whether the SOC of the battery is greater than the third threshold, whether there is a fault alarm in the battery, and whether the temperature of the battery cell of the battery is within the first range, so that the SOC of the battery is the third threshold. By controlling the charging circuit of the battery to be conducted only when the value is greater than the value, there is no fault alarm in the battery, and the temperature of the battery cell of the battery is within the first range, floating charging of the battery and safety problems can be prevented.

In some embodiments, a technical solution is also provided for controlling the charging circuit of the battery to be turned on and then cut off. 5 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention. As shown in Figure 5, the circuit control method,

S501: After the charging circuit of the battery is turned on, whether the rate of change of the charging current of the battery within the second duration is greater than the fourth threshold, or whether the voltage of the battery cell in the battery is greater than or equal to the fifth threshold, or determining whether there is a fault alarm in the battery or whether the temperature of the battery cell is not within a first range; and

S502: The rate of change of the charging current of the battery within the second duration is greater than the fourth threshold, the voltage of the battery cell in the battery is greater than or equal to the fifth threshold, there is a fault alarm in the battery, or the battery cell's and when the temperature is not within the first range, sending a second command, wherein the second command is for controlling the first switching unit in the charging circuit to be cut off to cut off the charging circuit.

Here, the change rate of the charging current of the battery within the second duration is greater than the fourth threshold is the first condition for the charging circuit to be cut off, and the voltage of a battery cell of the battery is greater than or equal to the fifth threshold is the charging circuit. is the second condition for being cut off, the existence of a fault alarm in the battery is the third condition for cutting off the charging circuit, and the temperature of the battery cell not being in the first range is the fourth condition for cutting off the charging circuit. .

Generally, after the vehicle is started, the charging circuit of the battery is conducted, and the generator charges the lithium battery. If the voltage of the lead-acid battery is greater than the first threshold value (eg >27V) after the vehicle is turned off, then the lead-acid battery charges the lithium battery, and the charging circuit remains conducting. When starting immediately after the engine is turned off, if the charging circuit is conducted, the charging circuit is discharged with a large current and the switch (eg relay) of the charging circuit is stuck, resulting in overcharging of the lithium battery and thermal runaway of the battery. As a result, safety accidents such as battery fires occur. Therefore, in this case, it is necessary to set a condition for controlling the charging circuit of the battery to be cut off. For example, when the vehicle is turned off (non-starting), the charging circuit of the battery must be cut off.

After the vehicle is started, the generator charges the lithium battery, the charging current of the battery is a normal value, and when the ignition is suddenly turned off, the charging current quickly drops to zero, so that the rate of change of the charging current of the battery within the second duration is A condition greater than 4 thresholds is set as the first condition for the charging circuit to be cut off, so that if the rate of change of the charging current of the battery within the second duration is less than or equal to the fourth threshold and does not satisfy the first condition, this is the vehicle Since it means that the ignition is turned off, there is no need to cut off the charging circuit, and the charging circuit can maintain conduction. If the change rate of the charging current of the battery within the second duration is greater than the fourth threshold and satisfies the first condition, this means that the vehicle has already turned off, so the charging circuit is cut off to prevent overcharging of the lithium battery. Should be.

The BMS may calculate a change rate of the charging current within the second duration according to the obtained charging current of the battery and compare it with a fourth threshold. Since a specific duration may be required for the output current of the generator to change from a normal value to no output, the second duration and the fourth threshold may be set according to the duration and the change rate of the current from the normal value to no output. . For example, since it takes about 1 s for the generator output current to change from a normal value of 110 A to a non-output 0 A, the second duration may be set to 1 s and the fourth threshold may be set to 110 A.

When charging the battery, overcharging protection must be performed to prevent overcharging. Accordingly, overcharging protection of the battery may be performed by setting the fifth threshold. The fifth threshold may be set according to an overcharge protection mechanism of the battery, for example, the fifth threshold is set to 3.65V. If the voltage of the battery cell of the battery is greater than or equal to the fifth threshold, the second condition is satisfied, and in this case, the charging circuit should be cut off to prevent overcharging of the lithium battery. If the voltage of the battery cell of the battery is less than the fifth threshold, the second condition is not satisfied, and in this case, the charging circuit does not need to be cut off, and the charging circuit can maintain conduction.

If there is a fault alarm in the battery, the battery cannot be charged, otherwise it is easy to cause safety problems. At this time, it is necessary to prevent a safety problem from occurring by controlling the charging circuit to be cut off by satisfying the third condition.

When charging the battery, it is necessary to ensure that the temperature of the internal battery cell is within the allowable charging range, otherwise it is easy to cause safety problems. The first range is the above allowable charging range, for example, 0 to 55°C. When the temperature of the battery cell of the battery is not within the first range, the fourth condition is satisfied and the charging circuit is controlled to be cut off, thereby preventing a safety problem from occurring.

The first condition, the second condition, the third condition, and the fourth condition are used as sufficient conditions for determining whether to cut off the charging circuit after the charging circuit of the battery is turned on. Therefore, if any one of the above conditions is satisfied in S502, the charging circuit may be blocked by controlling the first switching unit in the charging circuit to be cut off.

By sending a second command to the first switching unit in the charging circuit through the BMU interface of the BMS, the first switching unit in the controlling charging circuit is controlled to be cut off, thereby blocking the charging circuit. The second command may be a high-low level signal.

It should be appreciated that, in some embodiments, the circuit control method may further include the steps of any one of the embodiments shown in FIGS. 1-4 or a combination of steps of these embodiments.

In some embodiments, if the device wake-up signal does not exist, it means that the vehicle is not started, and the charging circuit must be controlled to be cut off at this time as well.

In the above embodiment, whether the change rate of the charging current of the battery within the second duration is greater than the fourth threshold, or whether the voltage of a battery cell in the battery is greater than or equal to the fifth threshold, or whether the battery has a fault alarm. or whether the temperature of the battery cell is not within the first range, the rate of change of the charging current of the battery within the second duration is greater than the fourth threshold, or the voltage of the battery cell of the battery is the fifth threshold greater than or equal to the value, when there is a fault alarm in the battery, or when the temperature of the battery cell is not within the first range, by controlling the charging circuit to be cut off, thereby ensuring that the charging circuit is cut off when the vehicle is not started to ensure that the lithium Prevent battery overcharging and safety issues.

In the above embodiment, it is determined whether the SOC of the battery is greater than the third threshold, whether there is a fault alarm in the battery, and whether the temperature of the battery cell of the battery is within the first range, so that the SOC of the battery is the third threshold. By controlling the charging circuit of the battery to be conducted only when the value is greater than the value, there is no fault alarm in the battery, and the temperature of the battery cell of the battery is within the first range, floating charging of the battery and safety problems can be prevented.

Lead-acid batteries are heavy and have a short lifespan as their self-discharge rate is high enough to reach 20% to 30% per month. If the vehicle is left unattended for a long time, the vehicle will not start due to power loss of the lead-acid battery. Therefore, in some embodiments, a technical solution is provided for controlling the charging circuit of the battery to be conducted after the battery is left unused for a long time. 6 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention. As shown in Figure 6, the circuit control method,

S601: judging whether a device wake-up signal exists and whether a power terminal voltage is less than a sixth threshold; and

S602: When the device wake-up signal exists and the power supply voltage is less than the sixth threshold, a third command is sent, the third command controls the first switching unit in the charging circuit to be closed, and the charging circuit is conducted to charge. and to cause the circuit to be in a first conducting state.

The sixth threshold may be set according to a maximum voltage of the lead-acid battery when power loss occurs, and the sixth threshold is set to a maximum voltage of the lead-acid battery when power loss occurs. For example, when the voltage of the lead-acid battery is about 16V to about 22V in a power loss state, the sixth threshold may be set to 22V. When the power terminal voltage is less than the above value, it means that the lead-acid battery is in a power loss state, so the charging circuit can be energized to charge the lead-acid battery, provide electrical energy for subsequent vehicle starting, and shorten the service life of the lead-acid battery. and the vehicle neglect time can be extended.

Here, the existence of the device wake-up signal is the first condition for allowing the charging circuit to be conducted, and the power supply voltage being less than the sixth threshold is the second condition for allowing the charging circuit to be conducting. The first condition and the second condition are used as necessary conditions for determining whether or not the charging circuit can be conducted together. Therefore, only when all of the above conditions are satisfied in S602, the first switching unit in the charging circuit is controlled to be closed so that the charging circuit is conducted.

It can be understood that the charging circuit is not conducted unless any of the above conditions are satisfied, thereby maintaining the charging circuit blocking state or blocking the charging circuit.

By sending a third command to the first switching unit in the charging circuit via the BMU interface of the BMS, the first switching unit in the charging circuit is controlled to be closed so that the charging circuit can be conducted. The third command may be a high-low level signal.

In some embodiments, a delay condition may be added in step S602, for example, when a device wake-up signal exists and the power supply voltage is less than the sixth threshold, a third command is transmitted for a delay time t to conduct the charging circuit. When the key is inserted into the keyhole of the vehicle and rotated, it is first positioned in the ACC gear, at this time (not yet reached the ignition ON gear), the BMS can detect the device wake-up signal (KL15), and at this time, the power supply voltage is also If less than the 6 threshold is detected, a third command is sent to conduct the charging circuit. When the charging circuit is ignited and the vehicle is started, the lithium battery is discharged to start the engine, thereby causing the above-mentioned thermal runaway of the battery and causing safety accidents such as fire of the battery. Therefore, by setting a certain delay time t and then conducting the charging circuit, it is possible to start the vehicle when the charging circuit of the battery is conducting, so that the charging circuit of the battery is conducting when the vehicle is not started and subsequently When the vehicle is started, the charging circuit of the battery is discharged with a large current to prevent a switch from sticking to the charging circuit, and to prevent thermal runaway of the battery due to overcharging of the lithium battery, thereby improving battery safety. The delay time t is set to satisfy the key operation duration from the ACC gear to the ON gear, for example, it can be set to 10s, 30s or 60s. It should be appreciated that in some embodiments, the circuit control method may further include steps of any one of the embodiments shown in FIGS. 1-5 or a combination of steps of these embodiments.

In the above embodiment, it is determined whether a device wake-up signal exists and whether the power supply voltage is less than the sixth threshold, and charging is performed when the device wake-up signal exists and the power supply voltage is less than the sixth threshold. By controlling the circuit to conduction and charging the lead-acid battery with the lithium battery, a problem in which the vehicle does not start due to power loss of the lead-acid battery when the vehicle is left unattended for a long time is prevented.

In some embodiments, other conditions for conduction of the charging circuit may be set based on the embodiment shown in FIG. 6 . 7 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention. As shown in Figure 7, the circuit control method,

S601: judging whether a device wake-up signal exists and whether a power terminal voltage is less than a sixth threshold;

S702: judging whether the SOC of the battery is greater than a seventh threshold and whether a failure alarm exists in the battery; and

S703: When the device wake-up signal exists, the power supply voltage is less than the sixth threshold, the SOC of the battery is greater than the seventh threshold, and there is no battery failure alarm, send a third command; The third instruction includes a step for controlling the first switching unit in the charging circuit to be closed so as to make the charging circuit conduction so that the charging circuit is in the first conduction state.

Here, the specific implementation process of S601 is basically the same as that of S601 in the foregoing embodiment, and the implementation process can refer to the above description.

The SOC of the battery being greater than the seventh threshold is the third condition that the charging circuit can be turned on, and the absence of a fault alarm in the battery is the fourth condition that the charging circuit can be turned on.

If the lithium battery continuously charges the lead-acid battery when the vehicle is left unattended for a long time, the lithium battery may over-discharge. Overdischarge increases the internal pressure of the lithium battery, destroys the reversibility of the positive and negative active materials, and greatly reduces the capacity. Therefore, if the seventh threshold is set so that the SOC of the battery is less than or equal to the seventh threshold, it means that it is not suitable for re-discharging. At this time, since the third condition is not satisfied and the charging circuit cannot be conducted, the vehicle When left unattended for a long time, the lithium battery continuously charges the lead-acid battery to prevent over-discharge of the lithium battery. The charging circuit is turned on only when the SOC of the battery is greater than the seventh threshold, and the lithium battery charges the lead-acid battery. The seventh threshold value may be set according to the discharge end SOC value of the lithium battery. For example, the seventh threshold is set to 15%.

If there is a fault alarm in the battery, the battery cannot be charged, otherwise it is easy to cause safety problems. Since there is no fault alarm in the battery, the charging circuit can be controlled to conduct only when the fourth condition is satisfied, thereby preventing safety problems from occurring.

The third condition, the fourth condition, and the first condition and the second condition of S601 are used together as a necessary condition for determining whether or not the charging circuit can be turned on. Therefore, in step S703, the first switching unit in the charging circuit is controlled to be closed only when all of the above conditions are satisfied to conduct the charging circuit.

It can be understood that the charging circuit is not conducted unless any of the above conditions are satisfied, thereby maintaining the charging circuit blocking state or blocking the charging circuit.

In the above embodiment, it is determined whether the SOC of the battery is greater than the seventh threshold and whether there is a fault alarm in the battery, and when the SOC of the battery is greater than the seventh threshold and there is no fault alarm in the battery By controlling the charging circuit to conduct, overdischarge and safety problems of the lithium battery are prevented.

In some embodiments, a technical solution is also provided for controlling the charging circuit to be cut off after leaving the battery for a long time and controlling the charging circuit to conduct. 8 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention. As shown in Figure 8, the circuit control method,

S801: In the first conduction state, judging whether the conduction time of the charging circuit is greater than an eighth threshold; and

S802: If the conduction time of the charging circuit is greater than the eighth threshold, send a fourth command, the fourth command is for controlling the first switching unit in the charging circuit to be cut off to cut off the charging circuit .

The conduction time of the charging circuit being greater than the eighth threshold is the first condition for the charging circuit to be cut off. The first conduction state is the first conduction state in the embodiment shown in FIG. 6 or 7, that is, the battery charging circuit is controlled to be conducted after the battery is left unattended for a long time. At this time, the conduction state of the charging circuit is It is different from the conduction state of the charging circuit of the embodiment shown in FIG. 5 .

In order to solve the problem that the vehicle does not start due to power loss of the lead-acid battery after leaving the vehicle for a long time, the lead-acid battery may be charged with a lithium battery through the embodiments shown in FIGS. 6 and 7 . The lithium battery can charge the lead-acid battery until it can meet the electrical energy required to start the vehicle once, and then stop charging. Therefore, if the eighth threshold is set so that the conduction time of the charging circuit is greater than the eighth threshold, this means that the amount of electricity of the lead-acid battery can satisfy the electric energy required for starting the vehicle once, and thus the charging circuit Charging can be stopped by blocking. The eighth threshold may be set according to the time required to charge the lead-acid battery until the electric energy required for starting the vehicle once is met.

By sending a fourth command to the first switching unit in the charging circuit through the BMU interface of the BMS, the first switching unit in the charging circuit is controlled to be cut off, thereby blocking the charging circuit. The fourth command may be a high-low level signal.

In some embodiments, other conditions for disconnection of the charging circuit may also be set, for example, no device wake-up signal is the second condition for disconnection of the charging circuit, and no battery fault alarm is present. This is the third condition for the charging circuit to be cut off. The first condition, the second condition, and the third condition are sufficient conditions for determining whether or not to cut off the charging circuit after the charging circuit of the battery is turned on. If any one of the above conditions is satisfied, the charging circuit may be cut off by controlling the first switching unit in the charging circuit to be cut off.

In the above embodiment, it is determined whether the conduction time of the charging circuit is greater than the eighth threshold, and if the conduction time of the charging circuit is greater than the eighth threshold, the charging circuit is cut off, so that the lithium battery is discharged once in the vehicle. It not only ensures that lead-acid batteries are charged to meet the electrical energy required for start-up, but also prevents over-discharge of lithium batteries.

Some embodiments also provide a technical solution for controlling the discharge circuit of the battery to conduct. 9 is a flow diagram of a circuit control method provided by some embodiments of the present invention. As shown in Figure 9, the circuit control method,

S901: Determining whether the SOC of the battery is greater than a seventh threshold; and

S902: When the SOC of the battery is greater than the seventh threshold, send a fifth command, the fifth command is to control the second switching unit in the discharging circuit of the battery to be closed so that the discharging circuit conducts, and the discharging circuit is the device and a circuit that connects the battery and electrical equipment of the phase.

Here, the discharge circuit is a circuit connecting the battery and the electrical equipment on the device, and may be specifically, the discharge circuit B in FIG. 2 and the discharge circuit B1 in FIG. 3 connecting the lithium battery and the electrical equipment. The second switching unit may be K2 in FIG. 2 , which may be an element such as a relay capable of conducting and breaking a circuit. Understandably, the second switching unit is located inside the lithium battery.

The fact that the SOC of the battery is greater than the seventh threshold is the first condition that the discharge circuit can be conducted.

Lithium batteries are a power source that supplies electricity to electrical equipment, such as the batteries that power parking air conditioners. If the lithium battery continuously supplies electricity to the electrical equipment when the electrical equipment is operated for a long time, the lithium battery may be over-discharged. Overdischarge increases the internal pressure of the lithium battery, destroys the reversibility of the positive and negative active materials, and greatly reduces the capacity. Therefore, if the seventh threshold value is set so that the SOC of the battery is less than or equal to the seventh threshold value, this means that the battery is not suitable for discharging. At this time, the discharge circuit cannot be conducted because the first condition is not satisfied. , to prevent over-discharge of the lithium battery caused by the lithium battery continuously supplying electricity to the electric device. The discharge circuit is conducted only when the SOC of the battery is greater than the seventh threshold, and the lithium battery supplies electricity to electrical equipment. The seventh threshold value may be set according to the discharge end SOC value of the lithium battery. For example, the seventh threshold is set to 15%.

By sending a fifth command to the second switching unit in the discharging circuit via the BMU interface of the BMS, the second switching unit in the discharging circuit is controlled to be closed so that the discharging circuit can be conducted. The fifth command may be a high-low level signal.

In some embodiments, other conditions for conduction of the discharge circuit may also be established, for example, the presence of a device wake-up signal is the second condition that the discharge circuit may conduct, and the absence of a fault alarm on the battery is This is the third condition in which the discharge circuit can be conducted. The first condition, the second condition, and the third condition together are used as necessary conditions for determining whether or not the discharge circuit can be conducted. Only when all of the above conditions are satisfied, the second switching unit in the discharge circuit is controlled to be closed to conduct the discharge circuit.

As can be understood, if any one of the above conditions is not met, the discharging circuit is kept disconnected by not conducting, or the discharging circuit is disconnected.

In the above embodiment, it is determined whether the SOC of the battery is greater than the seventh threshold value, and if the SOC of the battery is greater than the seventh threshold value, the battery discharge circuit is controlled to conduct, thereby preventing overdischarge of the lithium battery.

In some embodiments, a technical solution is also provided for controlling the discharging circuit of the battery to be turned on and then cut off. 10 is a flow schematic diagram of a circuit control method provided by some embodiments of the present invention. As shown in FIG. 10, the circuit control method,

S1001: After the discharge circuit of the battery is turned on, judging whether there is no device wake-up signal, whether there is a fault alarm in the battery, or whether the SOC of the battery is less than or equal to a seventh threshold; and

S1002: When the device wake-up signal does not exist, the battery has a fault alarm, or the SOC of the battery is less than or equal to the seventh threshold, send a sixth command, wherein the sixth command is the second switching in the discharge circuit and controlling the unit to be cut off to cut off the discharge circuit.

Here, the absence of the device wake-up signal is the first condition for the discharge circuit to be cut off, the presence of a fault alarm in the battery is the second condition for the discharge circuit to be cut off, and the SOC of the battery is less than the seventh threshold or The same is the third condition for the discharge circuit to be cut off.

If the device wake-up signal does not exist, it means that the vehicle has not been started. At this time, the lithium battery does not need to supply electricity to the electrical equipment, and it is not necessary to control the discharge circuit to conduct because the first condition is not satisfied. does not exist.

If there is a fault alarm in the battery, the battery cannot be discharged, otherwise it is easy to cause safety problems. At this time, it is necessary to prevent a safety problem from occurring by controlling the discharge circuit to be cut off by satisfying the second condition.

If the lithium battery continuously supplies electricity to the electrical equipment when the electrical equipment is operated for a long time, the lithium battery may be over-discharged. Overdischarge increases the internal pressure of the lithium battery, destroys the reversibility of the positive and negative active materials, and greatly reduces the capacity. Therefore, if the seventh threshold value is set so that the SOC of the battery is less than or equal to the seventh threshold value, this means that the battery is not suitable for discharging. It is necessary to prevent over-discharge of the lithium battery caused by continuously supplying electricity to the electrical device. The seventh threshold value may be set according to the discharge end SOC value of the lithium battery. For example, the seventh threshold is set to 15%.

The first condition, the second condition, and the third condition are sufficient conditions for determining whether or not to cut off the discharge circuit after the discharge circuit of the battery is conducted. Therefore, if any one of the above conditions is satisfied in step S1002, the discharge circuit may be cut off by controlling the second switching unit in the discharge circuit to be cut off.

By sending a sixth command to the second switching unit in the discharging circuit via the BMU interface of the BMS, the second switching unit in the discharging circuit is controlled to be cut off, thereby shutting off the discharging circuit. The sixth command may be a high-low level signal.

It should be appreciated that in some embodiments, the circuit control method may further include the steps of the embodiment shown in FIG. 9 .

In the above embodiment, it is judged whether the device wake-up signal is not present, or whether the battery has a fault alarm, or whether the SOC of the battery is less than or equal to the seventh threshold, so that the device wake-up signal is not present. In the case where the lithium battery is not discharged, the battery has a fault alarm, or the SOC of the battery is less than or equal to the seventh threshold value, the discharge circuit is controlled to be cut off, thereby preventing overdischarge of the lithium battery and safety problems.

The circuit control method of the embodiment of the present invention has been described by combining FIGS. 1 to 10 above, and the battery controller of the embodiment of the present invention by combining FIG. Reference may be made to the examples. 11 is a structural schematic diagram of a battery controller provided by some embodiments of the present invention. As shown in FIG. 11, the battery controller 1100 operates alone or jointly to perform the steps of the circuit control method of the above embodiment. It includes one or more processors 1101 for

Hereinafter, a battery management system according to an embodiment of the present invention will be described by combining FIG. 12 , but parts not described in detail herein may refer to each of the foregoing embodiments. 12 is a structural schematic diagram of a battery management system provided by some embodiments of the present invention. As shown in FIG. 12 , the battery management system 1200 includes at least one processor 1201; and a memory (1202) communicatively coupled to the at least one processor (1201); Instructions executable by the at least one processor 1201 are stored in the memory 1202, and the instructions are executed by the at least one processor 1201 so that the at least one processor 1201 operates according to the embodiment. Implement the steps of the circuit control method.

Hereinafter, the battery of the embodiment of the present invention is described by combining FIG. 13, but parts not described in detail herein may refer to each of the foregoing embodiments. 13 is a structural schematic diagram of a battery provided by some embodiments of the present invention. As shown in FIG. 13 , the battery 1300 includes the battery controller 1100 as shown in FIG. 11 .

Hereinafter, the battery of the embodiment of the present invention is described by combining FIG. 14, but parts not described in detail herein may refer to each of the foregoing embodiments. 14 is a structural schematic diagram of a battery provided by some embodiments of the present invention. As shown in FIG. 14 , a battery 1400 includes a battery management system 1200 as shown in FIG. 12 .

Hereinafter, an electric device according to an embodiment of the present invention will be described by combining FIG. 15, but parts not described in detail herein may refer to each of the foregoing embodiments. 15 is a structural schematic diagram of an electric device provided by some embodiments of the present invention. As shown in FIG. 15, an electric device 1500 includes a battery 1300 or a battery 1400 as in the above embodiment. do.

Hereinafter, a vehicle according to an embodiment of the present invention will be described by combining FIG. 16 , but parts not described in detail herein may refer to each of the above-described embodiments. 16 is a structural schematic diagram of a vehicle provided by some embodiments of the present invention. As shown in FIG. 16, a vehicle 1600 includes a lithium battery 1601, a generator 1602, and a vehicle wake-up switch 1603. Including; The lithium battery 1601 is connected to the generator 1602 to form a charging circuit, the lithium battery 1601 includes a battery management system 1604, the battery management system 1604,

obtain a vehicle wake-up signal;

It is determined whether the power terminal voltage of the lithium battery charging circuit of the vehicle is greater than a first threshold value and whether a rate of change within a first duration is smaller than a second threshold value, wherein the charging circuit determines whether the lithium battery of the vehicle and the generator are A circuit connecting the power terminal voltage is the output voltage of the generator;

When the voltage of the power terminal of the battery charging circuit of the vehicle is greater than a first threshold and a rate of change within a first duration is less than a second threshold, a first command is transmitted, wherein the first command is the first command of the charging circuit This is to conduct the charging circuit by controlling the switching unit to be closed.

Finally, each of the above embodiments is only intended to illustrate the technical solutions of the present invention and is not intended to limit them; Although the present invention has been described in detail with reference to each of the foregoing embodiments, a person skilled in the art may still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some or all of the technical features; It should be understood that these modifications or replacements do not deviate the nature of the technical solutions from the scope of the technical solutions of each embodiment of the present invention, and should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment may be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein and includes all technical solutions within the scope of the claims.

Claims (13)

As a circuit control method,
obtaining a device wakeup signal;
Determine whether a power terminal voltage of a battery charging circuit in the device is greater than a first threshold and whether a rate of change within a first duration is less than a second threshold, wherein the charging circuit connects a battery in the device and a generator. a circuit, wherein the power terminal voltage is an output voltage of the generator; and
When a power supply voltage of a battery charging circuit on the device is greater than a first threshold and a rate of change within a first duration is less than a second threshold, send a first command, wherein the first command is the first command of the charging circuit and controlling a switching unit to be closed so as to conduct the charging circuit. According to claim 1,
The method,
further comprising determining whether a state of charge (SOC) of the battery is greater than a third threshold, whether a failure alarm exists in the battery, and whether a temperature of a battery cell of the battery is within a first range;
When the power supply voltage of the battery charging circuit on the device is greater than a first threshold and a rate of change within a first duration is less than a second threshold, the step of sending a first command comprises:
The power supply voltage of the battery charging circuit on the device is greater than a first threshold, the rate of change within a first duration is less than a second threshold, the SOC of the battery is greater than a third threshold, and a fault alarm is issued to the battery. does not exist and the battery cell temperature of the battery is within a first range, transmitting a first command. According to claim 1 or 2,
The method,
After the charging circuit of the battery is turned on, whether the rate of change of the charging current of the battery within the second duration is greater than a fourth threshold, or whether the voltage of a battery cell in the battery is greater than or equal to a fifth threshold, or determining whether a failure alarm exists in the battery or whether the temperature of the battery cell is not within a first range; and
The change rate of the charge current of the battery within the second duration is greater than a fourth threshold, the voltage of a battery cell of the battery is greater than or equal to a fifth threshold, a fault alarm exists in the battery, or the battery and sending a second command when the temperature of the cell is not within the first range, wherein the second command is for controlling the first switching unit in the charging circuit to be cut off to cut off the charging circuit. A circuit control method characterized in that for doing. According to any one of claims 1 to 3,
The method,
determining whether a device wake-up signal exists and whether the power supply voltage is less than a sixth threshold; and
When a device wake-up signal is present and the power supply voltage is less than a sixth threshold, a third command is sent, the third command controlling the first switching unit in the charging circuit to be closed so as to conduct the charging circuit. The circuit control method of claim 1, further comprising the step of causing the charging circuit to be in a first conducting state. According to claim 4,
The method,
further comprising determining whether the SOC of the battery is greater than a seventh threshold and whether a failure alarm exists in the battery;
When the device wake-up signal is present and the power supply voltage is less than a sixth threshold, sending a third command comprises:
Sending a third command when a device wake-up signal exists, the power supply voltage is less than a sixth threshold, the SOC of the battery is greater than a seventh threshold, and there is no fault alarm in the battery. A circuit control method further comprising a step. According to claim 5,
The method,
determining whether a conduction time of the charging circuit is greater than an eighth threshold value in the first conduction state; and
if the conduction time of the charging circuit is greater than an eighth threshold, sending a fourth command, the fourth command controlling the first switching unit in the charging circuit to be cut off to cut off the charging circuit; A circuit control method further comprising: According to any one of claims 1 to 6,
The method,
determining whether the SOC of the battery is greater than a seventh threshold; and
When the SOC of the battery is greater than a seventh threshold, a fifth command is sent, the fifth command is for controlling a second switching unit in a discharge circuit of the battery to be closed so as to conduct the discharge circuit; The circuit control method according to claim 1 , wherein the circuit is a circuit connecting a battery on the device and electrical equipment. According to claim 7,
The method,
After the discharge circuit of the battery is turned on, determining whether the device wake-up signal exists, whether a fault alarm exists in the battery, or whether the SOC of the battery is less than or equal to a seventh threshold value. ; and
When the device wake-up signal is present, the battery has a fault alarm, or the SOC of the battery is less than or equal to a seventh threshold, send a sixth command, wherein the sixth command is the first one of the discharging circuitry. 2. The circuit control method further comprising the step of controlling the switching unit to cut off the discharge circuit. As a battery controller,
A battery controller characterized in that it comprises one or more processors for performing the steps of the circuit control method according to any one of claims 1 to 8, operating alone or jointly. As a battery management system,
at least one processor; and
Including a memory communicatively coupled to the at least one processor,
Instructions executable by the at least one processor are stored in the memory, and the instructions are executed by the at least one processor so that the at least one processor controls the circuit according to any one of claims 1 to 8. A battery management system, characterized in that to implement the steps of the method. As a battery,
A battery comprising the battery controller according to claim 9 or the battery management system according to claim 10. As an electrical device,
An electrical device comprising a battery according to claim 11 for providing electrical energy. As a vehicle,
including lithium batteries, generators and vehicle wake-up switches; The lithium battery is connected to the generator to form a charging circuit, the lithium battery includes a battery management system, the battery management system,
obtain a vehicle wake-up signal;
It is determined whether the power terminal voltage of the lithium battery charging circuit of the vehicle is greater than a first threshold value and whether a rate of change within a first duration is smaller than a second threshold value, wherein the charging circuit determines whether the lithium battery of the vehicle and the generator are A circuit connecting the power terminal voltage is the output voltage of the generator;
When the voltage of the power terminal of the battery charging circuit of the vehicle is greater than a first threshold and a rate of change within a first duration is less than a second threshold, a first command is transmitted, wherein the first command is the first command of the charging circuit A vehicle characterized in that the switching unit is controlled to be closed to conduct the charging circuit.